A kind of anti-cracking and waterproofing agent for well shaft concrete based on freezing method

Abstract

The invention discloses a concrete anti-cracking waterproof agent for constructing a well bore based on a freezing method. The concrete anti-cracking waterproof agent comprises the components in percentage by weight: 3-5% of high-performance polycarboxylic acid water reducing agent, 1-4% of redispersable rubber powder, 10-30% of aluminum sulfate clinker, 10-30% of flint clay, 20-40% of fluorine gypsum and 10-55% of superfine slag powder. All the components are added according to the proportions and uniformly ground in a ball grinder. The concrete anti-cracking waterproof agent breaks through the convention of using silica fume in a process of preparing high-strength concrete and can ensure the construction of the well bore by using the freezing method, and the concrete is rapid in strength development and free of cracking, so that the anti-permeability and waterproof aims are achieved.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to an anti-cracking and waterproofing agent for wellbore concrete based on the freezing method. Background technique [0002] The shaft of the new coal mine is constructed by the freezing method, and the double-layer reinforced concrete plastic interlayer composite shaft wall structure is mainly used. According to the design requirements, the inner well wall is the main body of the permanent well wall, which acts as a water seal and bears all the water pressure. In recent years, with the increase of the thickness of the topsoil layer that the frozen shaft passes through, some extra-thick topsoil layers have reached more than 800m. The concrete in the structure is in a state of multidirectional stress under the joint action of the force and the supporting force of the wall tube. The surface soil aquifer water directly acts on the reinforced concrete well wall, and the w...

AI Technical Summary

Problems solved by technology

[0005] In the prior art, silica fume must be used to prepare high-strength concrete. However, when the addition of silica fume in concrete is increased from 5% to 10%, the early hydration heat of concrete will increase by 15% to 20%, and the cracking time of concrete will be advanced by 1 / 2 or so

On the other hand, the addition of silica fume will increase the viscosity of high-strength concrete, which will bring great difficulties to construction.